Smart-home device light rings with tapered transmissive sections for uniform output

ABSTRACT

A light ring assembly for a smart-home device may include a plurality of light-emitting diodes (LEDs) and a light guide, where the light guide may include a plurality of cutouts that receive the plurality of LEDs, and a plurality of transmissive sections between the plurality of cutouts where a thickness of the transmissive sections tapers as the transmissive sections extend away from the plurality of cutouts. The light ring assembly may also include an output surface that receives light emitted from the plurality of LEDs through the plurality of transmissive sections, where the output surface is substantially circular.

CROSS-REFERENCES TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional PatentApplication No. 62/612,621, filed on Dec. 31, 2017, titled UNIFORM LIGHTRINGS FOR SMART-HOME DEVICES, which is incorporated herein by reference.

TECHNICAL FIELD

This patent specification relates generally to uniform light ringsilluminated by a discrete number of light sources. More particularly,this patent specification describes light rings illuminated byLight-Emitting Diodes (LEDs) for smart-home devices, such as videocamera assemblies, keypads, security system sensors, thermostats, hazarddetectors, doorbells, and/or the like.

BACKGROUND

Smart-home devices are rapidly becoming part of the modern homeexperience. These devices may include thermostats, keypads, touchscreens, and/or other control devices for controlling environmentalsystems, such as HVAC systems or lighting systems. The smart-homeenvironment may also include smart appliances, such as washing machines,dishwashers, refrigerators, garbage cans, and so forth, that interfacewith control and/or monitoring devices to increase the level offunctionality and control provided to an occupant. Security systems,including cameras, keypads, sensors, motion detectors, glass-breaksensors, microphones, and so forth, may also be installed as part of thesmart-home architecture. Other smart—the home devices may includedoorbells, monitoring systems, hazard detectors, smart lightbulbs, andvirtually any other electronic device that can be controlled via awired/wireless network.

Many of these smart home devices may benefit from an illumination sourcethat is integrated with the smart-home device or incident upon an areasurrounding the smart-home device. For example, usage of video camerasin residential and commercial environments has increased substantially,in part due to lower prices and simplicity of deployment as part ofmonitoring and/or security systems. To provide high-quality video feedseven in low-light environments, a camera recording a scene may generallybenefit from having the scene be illuminated by a light source. Inanother example, smart-home devices, such as a keypad, that allow foruser interaction may also benefit from illumination when used at nightor in a dark environment. In yet another example, smart home devices mayalso provide a low level of illumination for security, emergency, and/ornight time lights. As smart home devices proliferate throughout a home,these devices can detect an occupant's presence and automaticallyilluminate the surrounding area in the dark so that the user can safelytravel through the environment.

BRIEF SUMMARY

A further understanding of the nature and advantages of the presentinvention may be realized by reference to the remaining portions of thespecification and the drawings. Also note that other embodiments may bedescribed in the following disclosure and claims.

In some embodiments, a light ring assembly for a smart-home device mayinclude a plurality of light-emitting diodes (LEDs) and a light guide.The light guide may include a plurality of cutouts that receive theplurality of LEDs and a plurality of transmissive sections between theplurality of cutouts. A thickness of the transmissive sections may taperas the transmissive sections extend away from the plurality of cutouts.The light ring assembly may also include an output surface that receiveslight emitted from the plurality of LEDs through the plurality oftransmissive sections. The output surface may be substantially circular.

In some embodiments, a method of generating a uniform light ring in asmart-home device may include generating light from a plurality oflight-emitting diodes (LEDs) and receiving the light from the pluralityof LEDs at a light guide. The light guide may include a plurality ofcutouts that receive the plurality of LEDs and a plurality oftransmissive sections between the plurality of cutouts. The method mayalso include channeling light down the plurality of transmissivesections. A thickness of the transmissive sections may taper as thetransmissive sections extend away from the plurality of cutouts. Themethod may further include emitting light from an output surface of thelight guide. The output surface may be substantially circular.

In any embodiments, any of the following features may be included in anycombination and without limitation. A light output of the output surfacemay be substantially uniform. The plurality of LEDs may include only twoLEDs. The light ring assembly may further include a light mask that iscoupled to the light guide. The light mask may include a Mylar tape thatis adhered to the exterior surface of the light guide. The light maskmay be coupled to a portion of the light guide that is at least in partdirectly above one of the plurality of cutouts. A width of the lightmask may taper as the light mask extends away from one of the pluralityof cutouts. The smart-home device may include a first reflectivesurface, where light emitted from the output surface of the light ringassembly may be reflected off of the first reflective surface beforeexiting the smart-home device. The smart-home device may include asecond reflective surface, where light reflected off of the firstreflective surface may be reflected off of the second reflective surfacebefore exiting the smart-home device. The plurality of cutouts may beevenly distributed in a circular pattern around the light guide. Theplurality of LEDs may be side-firing LEDs. The plurality of transmissivesections may run between each of the plurality of cutouts in asubstantially circular shape. The plurality of LEDs may be top-firingLEDs. The plurality of transmissive sections may run parallel to thelight emitted from the top-firing LEDs. The plurality of transmissivesections may have a scalloped shape. The smart-home device may include adiffusive ring through which light from the output surface may bediffused before leaving the smart-home device. The smart-home device mayinclude a video camera. The smart-home device may include a motionsensor of a security system. The light guide may include a plurality ofmicro-lenses in the plurality of transmissive sections.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an example of a smart-home environment within which one ormore of the devices, methods, systems, services, and/or computer programproducts described further herein will be applicable, according to someembodiments.

FIG. 2A illustrates a simplified block diagram of a representativenetwork architecture that includes a smart-home network in accordance,according to some embodiments.

FIG. 2B illustrates a simplified operating environment in which a serversystem interacts with client devices and smart devices, according tosome embodiments.

FIG. 3 is a block diagram illustrating a representative smart device inaccordance with some implementations.

FIG. 4 illustrates a flowchart of a method of generating a uniform lightring in a smart device, according to some embodiments.

FIG. 5 illustrates a simplified block diagram of how a tapered lightguide can be used to generate a uniform light ring from discrete LEDs.

FIG. 6 illustrates a flowchart of a method for generating a uniformlight ring.

FIG. 7 illustrates a simplified diagram of a transmissive section of alight guide with a plurality of micro-lenses, according to someembodiments.

FIG. 8 illustrates a smart device that may be used as a motion detectorand/or magnetic contact switch for a home security system, according tosome embodiments.

FIG. 9 illustrates an exploded view of the smart device for a homesecurity system, according to some embodiments.

FIG. 10 illustrates a side view of the light ring assembly from FIG. 9,according to some embodiments.

FIG. 11 illustrates a cross-sectional view of the light path exiting thedevice, according to some embodiments.

FIG. 12 illustrates a second implementation of a smart device that canbe installed in a smart-home environment, according to some embodiments.

FIG. 13 illustrates some of the internal components of the device.

FIG. 14 illustrates the three different pieces of the light guide.

FIG. 15 illustrates a view of the middle layer of the light guide,according to some embodiments.

FIG. 16 illustrates a cross-sectional view of the device that shows thelight path, according to some embodiments.

FIG. 17 illustrates a device that can be used as part of a home securitysystem or smart-home environment, according to some embodiments.

FIG. 18 illustrates a light ring assembly for a device having a keypad,according to some embodiments.

FIG. 19 illustrates a detailed view of the light guide, according tosome embodiments.

FIG. 20 illustrates a top view of the light guide with the tape masksapplied to the top of the light guide, according to some embodiments.

FIG. 21 illustrates a device that can be used as an indoor imagingcamera, according to some embodiments.

FIG. 22 illustrates a component view of a representative camera assemblyof device 2102, according to some embodiments.

FIG. 23 illustrates a view of the light guide, according to someembodiments.

FIG. 24 illustrates a cross-sectional view of the assembled device aslight is channeled from the LEDs to outside of the device as a uniformlight ring.

DETAILED DESCRIPTION

In the following detailed description, for purposes of explanation,numerous specific details are set forth to provide a thoroughunderstanding of the various embodiments of the present invention. Thoseof ordinary skill in the art will realize that these various embodimentsof the present invention are illustrative only and are not intended tobe limiting in any way. Other embodiments of the present invention willreadily suggest themselves to such skilled persons having the benefit ofthis disclosure. It will be apparent to one skilled in the art that thepresent invention may be practiced without some or all of these specificdetails. In other instances, well known details have not been describedin detail in order not to unnecessarily obscure the present invention.

In addition, for clarity purposes, not all of the routine features ofthe embodiments described herein are shown or described. One of ordinaryskill in the art would readily appreciate that in the development of anysuch actual embodiment, numerous embodiment-specific decisions may berequired to achieve specific design objectives. These design objectiveswill vary from one embodiment to another and from one developer toanother. Moreover, it will be appreciated that such a development effortmight be complex and time-consuming but would nevertheless be a routineengineering undertaking for those of ordinary skill in the art havingthe benefit of this disclosure.

FIG. 1 illustrates an example smart-home environment 100, according tosome embodiments. The smart-home environment 100 includes a structure150 (e.g., a house, office building, garage, or mobile home) withvarious integrated devices. It will be appreciated that devices may alsobe integrated into a smart-home environment 100 that does not include anentire structure 150, such as an apartment, condominium, or officespace. Further, the smart-home environment 100 may control and/or becoupled to devices outside of the actual structure 150. Indeed, severaldevices in the smart-home environment 100 need not be physically withinthe structure 150. For example, a device controlling a pool heater 114or irrigation system 116 may be located outside of the structure 150.

The term “smart-home environment” may refer to smart environments forhomes such as a single-family house, but the scope of the presentteachings is not so limited. The present teachings are also applicable,without limitation, to duplexes, townhomes, multi-unit apartmentbuildings, hotels, retail stores, office buildings, industrialbuildings, and more generally any living space or work space. Similarly,while the terms user, customer, installer, homeowner, occupant, guest,tenant, landlord, repair person, etc., may be used to refer to a personor persons acting in the context of some particular situations describedherein, these references do not limit the scope of the present teachingswith respect to the person or persons who are performing such actions.Thus, for example, the terms user, customer, purchaser, installer,subscriber, and homeowner may often refer to the same person in the caseof a single-family residential dwelling, because the head of thehousehold is often the person who makes the purchasing decision, buysthe unit, and installs and configures the unit, as well as being one ofthe users of the unit. However, in other scenarios, such as alandlord-tenant environment, the customer may be the landlord withrespect to purchasing the unit, the installer may be a local apartmentsupervisor, a first user may be the tenant, and a second user may againbe the landlord with respect to remote control functionality. While theidentity of the person performing the action may be germane to aparticular advantage provided by one or more of the implementations,such an identity should not be construed in the descriptions that followas necessarily limiting the scope of the present teachings to thoseparticular individuals having those particular identities.

The depicted structure 150 includes a plurality of rooms 152, separatedat least partly from each other via walls 154. The walls 154 may includeinterior walls or exterior walls. Each room may further include a floor156 and a ceiling 158. Devices may be mounted on, integrated with and/orsupported by a wall 154, floor 156, or ceiling 158.

In some implementations, the integrated devices of the smart-homeenvironment 100 include intelligent, multi-sensing, network-connecteddevices that integrate seamlessly with each other in a smart-homenetwork and/or with a central server or a cloud-computing system toprovide a variety of useful smart-home functions. The smart-homeenvironment 100 may include one or more intelligent, multi-sensing,network-connected thermostats 102 (hereinafter referred to as “smartthermostats 102”), one or more intelligent, network-connected,multi-sensing hazard detection units 104 (hereinafter referred to as“smart hazard detectors 104”), one or more intelligent, multi-sensing,network-connected entryway interface devices 106 and 120 (hereinafterreferred to as “smart doorbells 106” and “smart door locks 120”), andone or more intelligent, multi-sensing, network-connected alarm systems122 (hereinafter referred to as “smart alarm systems 122”). Although notdepicted explicitly in FIG. 1, the smart-home environment 100 may alsoinclude other monitoring systems, such as baby monitoring systems,elderly monitoring systems, handicapped monitoring systems, and soforth.

In some implementations, the one or more smart thermostats 102 detectambient climate characteristics (e.g., temperature and/or humidity) andcontrol a HVAC system 103 accordingly. For example, a respective smartthermostat 102 includes an ambient temperature sensor.

The one or more smart hazard detectors 104 may include thermal radiationsensors directed at respective heat sources (e.g., a stove, oven, otherappliances, a fireplace, etc.). For example, a smart hazard detector 104in a kitchen 153 may include a thermal radiation sensor directed at astove/oven 112. A thermal radiation sensor may determine the temperatureof the respective heat source (or a portion thereof) at which it isdirected and may provide corresponding blackbody radiation data asoutput.

The smart doorbell 106 and/or the smart door lock 120 may detect aperson's approach to or departure from a location (e.g., an outer door),control doorbell/door locking functionality (e.g., receive user inputsfrom a portable electronic device 166-1 to actuate bolt of the smartdoor lock 120), announce a person's approach or departure via audio orvisual devices, and/or control settings on a security system (e.g., toactivate or deactivate the security system when occupants go and come).In some implementations, the smart doorbell 106 may include some or allof the components and features of the camera 118. In someimplementations, the smart doorbell 106 includes a camera 118.

The smart alarm system 122 may detect the presence of an individualwithin close proximity (e.g., using built-in IR sensors), sound an alarm(e.g., through a built-in speaker, or by sending commands to one or moreexternal speakers), and send notifications to entities or userswithin/outside of the smart-home network 100. In some implementations,the smart alarm system 122 also includes one or more input devices orsensors (e.g., keypad, biometric scanner, NFC transceiver, microphone)for verifying the identity of a user, and one or more output devices(e.g., display, speaker) for providing notifications. In someimplementations, the smart alarm system 122 may also be set to an“armed” mode, such that detection of a trigger condition or event causesthe alarm to be sounded unless a disarming action is performed.

In some implementations, the smart-home environment 100 may include oneor more intelligent, multi-sensing, network-connected wall switches 108(hereinafter referred to as “smart wall switches 108”), along with oneor more intelligent, multi-sensing, network-connected wall pluginterfaces 110 (hereinafter referred to as “smart wall plugs 110”). Thesmart wall switches 108 may detect ambient lighting conditions, detectroom-occupancy states, and control a power and/or dim state of one ormore lights. In some instances, smart wall switches 108 may also controla power state or speed of a fan, such as a ceiling fan. The smart wallplugs 110 may detect occupancy of a room or enclosure and control supplyof power to one or more wall plugs (e.g., such that power is notsupplied to the plug if nobody is at home).

In some implementations, the smart-home environment 100 of FIG. 1 mayinclude a plurality of intelligent, multi-sensing, network-connectedappliances 112 (hereinafter referred to as “smart appliances 112”), suchas refrigerators, stoves, ovens, televisions, washers, dryers, lights,stereos, intercom systems, garage-door openers, floor fans, ceilingfans, wall air conditioners, pool heaters, irrigation systems, securitysystems, space heaters, window AC units, motorized duct vents, and soforth. In some implementations, when plugged in, an appliance mayannounce itself to the smart home network, such as by indicating whattype of appliance it is, and it may automatically integrate with thecontrols of the smart home. Such communication by the appliance to thesmart home may be facilitated by either a wired or wirelesscommunication protocol. The smart home may also include a variety ofnon-communicating legacy appliances 140, such as older-modelconventional washers/dryers, refrigerators, and/or the like, which maybe controlled by smart wall plugs 110. The smart-home environment 100may further include a variety of partially communicating legacyappliances 142, such as infrared (“IR”) controlled wall air conditionersor other IR-controlled devices, which may be controlled by IR signalsprovided by the smart hazard detectors 104, hand-held remote controls,key FOBs, or the smart wall switches 108.

In some implementations, the smart-home environment 100 may include oneor more network-connected cameras 118 that are configured to providevideo monitoring and security in the smart-home environment 100. Thecameras 118 may be used to determine the occupancy of the structure 150and/or particular rooms 152 in the structure 150, and thus may act asoccupancy sensors. For example, video captured by the cameras 118 may beprocessed to identify the presence of an occupant in the structure 150(e.g., in a particular room 152). Specific individuals may be identifiedbased, for example, on their appearance (e.g., height, face) and/ormovement (e.g., their walk/gait). Cameras 118 may additionally includeone or more sensors (e.g., IR sensors, motion detectors), input devices(e.g., microphone for capturing audio), and output devices (e.g.,speaker for outputting audio). In some implementations, the cameras 118may each be configured to operate in a day mode and in a low-light mode(e.g., a night mode). In some implementations, the cameras 118 eachinclude one or more IR illuminators for providing illumination while thecamera is operating in the low-light mode. In some implementations, thecameras 118 include one or more outdoor cameras. In someimplementations, the outdoor cameras include additional features and/orcomponents such as weatherproofing and/or solar ray compensation.

The smart-home environment 100 may additionally or alternatively includeone or more other occupancy sensors (e.g., the smart doorbell 106, smartdoor locks 120, touch screens, IR sensors, microphones, ambient lightsensors, motion detectors, smart nightlights 170, etc.). In someimplementations, the smart-home environment 100 may includeradio-frequency identification (RFID) readers (e.g., in each room 152 ora portion thereof) that determine occupancy based on RFID tags locatedon or embedded in occupants. For example, RFID readers may be integratedinto the smart hazard detectors 104, and RFID tags may be worn in usersclothing for integrated in hand-held devices such as a smart phone.

The smart-home environment 100 may also include communication withdevices outside of the physical home but within a proximate geographicalrange of the home. For example, the smart-home environment 100 mayinclude a pool heater monitor 114 that communicates a current pooltemperature to other devices within the smart-home environment 100and/or receives commands for controlling the pool temperature.Similarly, the smart-home environment 100 may include an irrigationmonitor 116 that communicates information regarding irrigation systemswithin the smart-home environment 100 and/or receives controlinformation for controlling such irrigation systems.

By virtue of network connectivity, one or more of the smart home devicesof FIG. 1 may further allow a user to interact with the device even ifthe user is not proximate to the device. For example, a user maycommunicate with a device using a computer (e.g., a desktop computer,laptop computer, or tablet) or other portable electronic device 166(e.g., a mobile phone, such as a smart phone). A webpage or applicationmay be configured to receive communications from the user and controlthe device based on the communications and/or to present informationabout the device's operation to the user. For example, the user may viewa current set point temperature for a device (e.g., a stove) and adjustit using a computer. The user may be in the structure during this remotecommunication or outside the structure.

As discussed above, users may control smart devices in the smart-homeenvironment 100 using a network-connected computer or portableelectronic device 166. In some examples, some or all of the occupants(e.g., individuals who live in the home) may register their device 166with the smart-home environment 100. Such registration may be made at acentral server to authenticate the occupant and/or the device as beingassociated with the home and to give permission to the occupant to usethe device to control the smart devices in the home. An occupant may usetheir registered device 166 to remotely control the smart devices of thehome, such as when the occupant is at work or on vacation. The occupantmay also use their registered device to control the smart devices whenthe occupant is actually located inside the home, such as when theoccupant is sitting on a couch inside the home. It should be appreciatedthat instead of or in addition to registering devices 166, thesmart-home environment 100 may make inferences about (1) whichindividuals live in the home and are therefore occupants, and (2) whichdevices 166 are associated with those individuals. As such, thesmart-home environment may “learn” who is an occupant and permit thedevices 166 associated with those individuals to control the smartdevices of the home.

In some implementations, in addition to containing processing andsensing capabilities, devices 102, 104, 106, 108, 110, 112, 114, 116,118, 120, and/or 122 (collectively referred to as “the smart devices” or“the smart-home devices”) are capable of data communications andinformation sharing with other smart devices, a central server orcloud-computing system, and/or other devices that are network-connected.Data communications may be carried out using any of a variety of customor standard wireless protocols (e.g., IEEE 802.15.4, Wi-Fi, ZigBee,6LoWPAN, Thread, Z-Wave, Bluetooth Smart, ISA100.5A, WirelessHART, MiWi,etc.) and/or any of a variety of custom or standard wired protocols(e.g., Ethernet, HomePlug, etc.), or any other suitable communicationprotocol, including communication protocols not yet developed as of thefiling date of this document.

In some implementations, the smart devices may serve as wireless orwired repeaters. In some implementations, a first one of the smartdevices communicates with a second one of the smart devices via awireless router. The smart devices may further communicate with eachother via a connection (e.g., network interface 160) to a network, suchas the Internet 162. Through the Internet 162, the smart devices maycommunicate with a server system 164 (also called a central serversystem and/or a cloud-computing system herein). The server system 164may be associated with a manufacturer, support entity, or serviceprovider associated with the smart device(s). In some implementations, auser is able to contact customer support using a smart device itselfrather than needing to use other communication means, such as atelephone or Internet-connected computer. In some implementations,software updates are automatically sent from the server system 164 tosmart devices (e.g., when available, when purchased, or at routineintervals).

In some implementations, the network interface 160 includes aconventional network device (e.g., a router), and the smart-homeenvironment 100 of FIG. 1 includes a hub device 180 that iscommunicatively coupled to the network(s) 162 directly or via thenetwork interface 160. The hub device 180 may be further communicativelycoupled to one or more of the above intelligent, multi-sensing,network-connected devices (e.g., smart devices of the smart-homeenvironment 100). Each of these smart devices optionally communicateswith the hub device 180 using one or more radio communication networksavailable at least in the smart-home environment 100 (e.g., ZigBee,Z-Wave, Insteon, Bluetooth, Wi-Fi and other radio communicationnetworks). In some implementations, the hub device 180 and devicescoupled with/to the hub device can be controlled and/or interacted withvia an application running on a smart phone, household controller,laptop, tablet computer, game console or similar electronic device. Insome implementations, a user of such controller application can viewstatus of the hub device or coupled smart devices, configure the hubdevice to interoperate with smart devices newly introduced to the homenetwork, commission new smart devices, and adjust or view settings ofconnected smart devices, etc. In some implementations the hub deviceextends the capabilities of low-capability smart devices to match thecapabilities of the highly capable smart devices of the same type,integrates functionality of multiple different device types—even acrossdifferent communication protocols, and is configured to streamlineadding of new devices and commissioning of the hub device. In someimplementations, hub device 180 further comprises a local storage devicefor storing data related to, or output by, smart devices of smart-homeenvironment 100. In some implementations, the data includes one or moreof: video data output by a camera device, metadata output by a smartdevice, settings information for a smart device, usage logs for a smartdevice, and the like.

In some implementations, smart-home environment 100 includes a localstorage device 190 for storing data related to, or output by, smartdevices of smart-home environment 100. In some implementations, the dataincludes one or more of: video data output by a camera device (e.g.,camera 118), metadata output by a smart device, settings information fora smart device, usage logs for a smart device, and the like. In someimplementations, local storage device 190 is communicatively coupled toone or more smart devices via a smart home network. In someimplementations, local storage device 190 is selectively coupled to oneor more smart devices via a wired and/or wireless communication network.In some implementations, local storage device 190 is used to store videodata when external network conditions are poor. For example, localstorage device 190 is used when an encoding bitrate of camera 118exceeds the available bandwidth of the external network (e.g.,network(s) 162). In some implementations, local storage device 190temporarily stores video data from one or more cameras (e.g., camera118) prior to transferring the video data to a server system (e.g.,server system 164).

In some implementations, the smart-home environment 100 includes servicerobots 168 that are configured to carry out, in an autonomous manner,any of a variety of household tasks.

FIG. 2A illustrates a simplified block diagram of a representativenetwork architecture 200 that includes a smart home network 202 inaccordance with some implementations. In some implementations, the smartdevices 204 in the smart-home environment 100 (e.g., devices 102, 104,106, 108, 110, 112, 114, 116, 118, 120, and/or 122) combine with the hubdevice 180 to create a mesh network in smart home network 202. In someimplementations, one or more smart devices 204 in the smart home network202 operate as a smart home controller. Additionally and/oralternatively, hub device 180 operates as the smart home controller. Insome implementations, a smart home controller has more computing powerthan other smart devices. In some implementations, a smart homecontroller processes inputs (e.g., from smart devices 204, electronicdevice 166, and/or server system 164) and sends commands (e.g., to smartdevices 204 in the smart home network 202) to control operation of thesmart-home environment 100. In some implementations, some of the smartdevices 204 in the smart home network 202 (e.g., in the mesh network)are “spokesman” nodes (e.g., 204-1) and others are “low-powered” nodes(e.g., 204-9). Some of the smart devices in the smart-home environment100 are battery powered, while others have a regular and reliable powersource, such as by connecting to wiring (e.g., to 120V line voltagewires) behind the walls 154 of the smart-home environment. The smartdevices that have a regular and reliable power source are referred to as“spokesman” nodes. These nodes are typically equipped with thecapability of using a wireless protocol to facilitate bidirectionalcommunication with a variety of other devices in the smart-homeenvironment 100, as well as with the server system 164. In someimplementations, one or more “spokesman” nodes operate as a smart homecontroller. On the other hand, the devices that are battery powered arethe “low-power” nodes. These nodes tend to be smaller than spokesmannodes and typically only communicate using wireless protocols thatrequire very little power, such as Zigbee, ZWave, 6LoWPAN, Thread,Bluetooth, etc.

In some implementations, some low-power nodes may be incapable ofbidirectional communication. These low-power nodes may send messages,but they are unable to “listen.” Thus, other devices in the smart-homeenvironment 100, such as the spokesman nodes, need not send informationto these low-power nodes. In some implementations, some low-power nodesare capable of only a limited bidirectional communication. For example,other devices are able to communicate with the low-power nodes onlyduring a certain time period.

In some implementations, the smart devices may serve as low-power andspokesman nodes to create a mesh network in the smart-home environment100. In some implementations, individual low-power nodes in thesmart-home environment may regularly send out messages regarding whatthey are sensing, and the other low-powered nodes in the smart-homeenvironment—in addition to sending out their own messages—may forwardthese messages, thereby causing the messages to travel from node to node(i.e., device to device) throughout the smart home network 202. In someimplementations, the spokesman nodes in the smart home network 202,which are able to communicate using a relatively high-powercommunication protocol, such as IEEE 802.11, are able to switch to arelatively low-power communication protocol, such as IEEE 802.15.4, toreceive these messages, translate the messages to other communicationprotocols, and send the translated messages to other spokesman nodesand/or the server system 164 (using, e.g., the relatively high-powercommunication protocol). Thus, the low-powered nodes using low-powercommunication protocols are able to send and/or receive messages acrossthe entire smart home network 202, as well as over the Internet 162 tothe server system 164. In some implementations, the mesh network enablesthe server system 164 to regularly receive data from most or all of thesmart devices in the home, make inferences based on the data, facilitatestate synchronization across devices within and outside of the smarthome network 202, and send commands to one or more of the smart devicesto perform tasks in the smart-home environment.

The spokesman nodes and some of the low-powered nodes are capable of“listening.” Accordingly, users, other devices, and/or the server system164 may communicate control commands to the low-powered nodes. Forexample, a user may use the electronic device 166 (e.g., a smart phone)to send commands over the Internet to the server system 164, which thenrelays the commands to one or more spokesman nodes in the smart homenetwork 202. The spokesman nodes may use a low-power protocol tocommunicate the commands to the low-power nodes throughout the smarthome network 202, as well as to other spokesman nodes that did notreceive the commands directly from the server system 164.

In some implementations, a smart nightlight 170, which is an example ofa smart device 204, is a low-power node. In addition to housing a lightsource, the smart nightlight 170 houses an occupancy sensor, such as anultrasonic or passive IR sensor, and an ambient light sensor, such as aphoto resistor or a single-pixel sensor that measures light in the room.In some implementations, the smart nightlight 170 is configured toactivate the light source when its ambient light sensor detects that theroom is dark and when its occupancy sensor detects that someone is inthe room. In other implementations, the smart nightlight 170 is simplyconfigured to activate the light source when its ambient light sensordetects that the room is dark. Further, in some implementations, thesmart nightlight 170 includes a low-power wireless communication chip(e.g., a ZigBee chip) that regularly sends out messages regarding theoccupancy of the room and the amount of light in the room, includinginstantaneous messages coincident with the occupancy sensor detectingthe presence of a person in the room. As described above, these messagesmay be sent wirelessly (e.g., using the mesh network) from node to node(i.e., smart device to smart device) within the smart home network 202as well as over the Internet 162 to the server system 164.

Other examples of low-power nodes include battery-operated versions ofthe smart hazard detectors 104. These smart hazard detectors 104 areoften located in an area without access to constant and reliable powerand may include any number and type of sensors, such as smoke/fire/heatsensors (e.g., thermal radiation sensors), carbon monoxide/dioxidesensors, occupancy/motion sensors, ambient light sensors, ambienttemperature sensors, humidity sensors, and the like. Furthermore, smarthazard detectors 104 may send messages that correspond to each of therespective sensors to the other devices and/or the server system 164,such as by using the mesh network as described above.

Examples of spokesman nodes include smart doorbells 106, smartthermostats 102, smart wall switches 108, and smart wall plugs 110.These devices are often located near and connected to a reliable powersource, and therefore may include more power-consuming components, suchas one or more communication chips capable of bidirectionalcommunication in a variety of protocols.

As explained above with reference to FIG. 1, in some implementations,the smart-home environment 100 of FIG. 1 includes a hub device 180 thatis communicatively coupled to the network(s) 162 directly or via thenetwork interface 160. The hub device 180 is further communicativelycoupled to one or more of the smart devices using a radio communicationnetwork that is available at least in the smart-home environment 100.Communication protocols used by the radio communication network include,but are not limited to, ZigBee, Z-Wave, Insteon, EuOcean, Thread, OSIAN,Bluetooth Low Energy and the like. In some implementations, the hubdevice 180 not only converts the data received from each smart device tomeet the data format requirements of the network interface 160 or thenetwork(s) 162, but also converts information received from the networkinterface 160 or the network(s) 162 to meet the data format requirementsof the respective communication protocol associated with a targetedsmart device. In some implementations, in addition to data formatconversion, the hub device 180 further processes the data received fromthe smart devices or information received from the network interface 160or the network(s) 162 preliminary. For example, the hub device 180 canintegrate inputs from multiple sensors/connected devices (includingsensors/devices of the same and/or different types), perform higherlevel processing on those inputs—e.g., to assess the overall environmentand coordinate operation among the different sensors/devices—and/orprovide instructions to the different devices based on the collection ofinputs and programmed processing. It is also noted that in someimplementations, the network interface 160 and the hub device 180 areintegrated to one network device. Functionality described herein isrepresentative of particular implementations of smart devices, controlapplication(s) running on representative electronic device(s) (such as asmart phone), hub device(s) 180, and server(s) coupled to hub device(s)via the Internet or other Wide Area Network (WAN). All or a portion ofthis functionality and associated operations can be performed by anyelements of the described system—for example, all or a portion of thefunctionality described herein as being performed by an implementationof the hub device can be performed, in different system implementations,in whole or in part on the server, one or more connected smart devicesand/or the control application, or different combinations thereof.

FIG. 2B illustrates a representative operating environment in which aserver system 164 provides data processing for monitoring andfacilitating review of events (e.g., motion, audio, security, etc.) invideo streams captured by video cameras 118. As shown in FIG. 2B, theserver system 164 receives video data from video sources 222 (includingcameras 118) located at various physical locations (e.g., inside homes,restaurants, stores, streets, parking lots, and/or the smart-homeenvironments 100 of FIG. 1). Each video source 222 may be bound to oneor more reviewer accounts, and the server system 164 provides videomonitoring data for the video source 222 to client devices 220associated with the reviewer accounts. For example, the portableelectronic device 166 is an example of the client device 220. In someimplementations, the server system 164 is a video processing server thatprovides video processing services to video sources and client devices220.

In some implementations, each of the video sources 222 includes one ormore video cameras 118 that capture video and send the captured video tothe server system 164 substantially in real-time. In someimplementations, each of the video sources 222 includes a controllerdevice (not shown) that serves as an intermediary between the one ormore cameras 118 and the server system 164. The controller devicereceives the video data from the one or more cameras 118, optionallyperforms some preliminary processing on the video data, and sends thevideo data to the server system 164 on behalf of the one or more cameras118 substantially in real-time. In some implementations, each camera hasits own on-board processing capabilities to perform some preliminaryprocessing on the captured video data before sending the processed videodata (along with metadata obtained through the preliminary processing)to the controller device and/or the server system 164.

In accordance with some implementations, each of the client devices 220includes a client-side module. The client-side module communicates witha server-side module executed on the server system 164 through the oneor more networks 162. The client-side module provides client-sidefunctionality for the event monitoring and review processing andcommunications with the server-side module. The server-side moduleprovides server-side functionality for event monitoring and reviewprocessing for any number of client-side modules each residing on arespective client device 220. The server-side module also providesserver-side functionality for video processing and camera control forany number of the video sources 222, including any number of controldevices and the cameras 118.

In some implementations, the server system 164 includes one or moreprocessors 212, a video storage database 210, an account database 214,an I/O interface to one or more client devices 216, and an I/O interfaceto one or more video sources 218. The I/O interface to one or moreclients 216 facilitates the client-facing input and output processing.The account database 214 stores a plurality of profiles for revieweraccounts registered with the video processing server, where a respectiveuser profile includes account credentials for a respective revieweraccount, and one or more video sources linked to the respective revieweraccount. The I/O interface to one or more video sources 218 facilitatescommunications with one or more video sources 222 (e.g., groups of oneor more cameras 118 and associated controller devices). The videostorage database 210 stores raw video data received from the videosources 222, as well as various types of metadata, such as motionevents, event categories, event category models, event filters, andevent masks, for use in data processing for event monitoring and reviewfor each reviewer account.

Examples of a representative client device 220 include a handheldcomputer, a wearable computing device, a personal digital assistant(PDA), a tablet computer, a laptop computer, a desktop computer, acellular telephone, a smart phone, an enhanced general packet radioservice (EGPRS) mobile phone, a media player, a navigation device, agame console, a television, a remote control, a point-of-sale (POS)terminal, a vehicle-mounted computer, an eBook reader, or a combinationof any two or more of these data processing devices or other dataprocessing devices.

Examples of the one or more networks 162 include local area networks(LAN) and wide area networks (WAN) such as the Internet. The one or morenetworks 162 are implemented using any known network protocol, includingvarious wired or wireless protocols, such as Ethernet, Universal SerialBus (USB), FIREWIRE, Long Term Evolution (LTE), Global System for MobileCommunications (GSM), Enhanced Data GSM Environment (EDGE), codedivision multiple access (CDMA), time division multiple access (TDMA),Bluetooth, Wi-Fi, voice over Internet Protocol (VoIP), Wi-MAX, or anyother suitable communication protocol.

In some implementations, the server system 164 may be implemented on oneor more standalone data processing apparatuses or a distributed networkof computers. In some implementations, the server system 164 alsoemploys various virtual devices and/or services of third party serviceproviders (e.g., third-party cloud service providers) to provide theunderlying computing resources and/or infrastructure resources of theserver system 164. In some implementations, the server system 164includes, but is not limited to, a server computer, a handheld computer,a tablet computer, a laptop computer, a desktop computer, or acombination of any two or more of these data processing devices or otherdata processing devices.

The server-client environment shown in FIG. 2B includes both aclient-side portion (e.g., the client-side module) and a server-sideportion (e.g., the server-side module). The division of functionalitybetween the client and server portions of operating environment can varyin different implementations. Similarly, the division of functionalitybetween a video source 222 and the server system 164 can vary indifferent implementations. For example, in some implementations, theclient-side module is a thin-client that provides only user-facing inputand output processing functions, and delegates all other data processingfunctionality to a backend server (e.g., the server system 164).Similarly, in some implementations, a respective one of the videosources 222 is a simple video capturing device that continuouslycaptures and streams video data to the server system 164 with limited orno local preliminary processing on the video data. Although many aspectsof the present technology are described from the perspective of theserver system 164, the corresponding actions performed by a clientdevice 220 and/or the video sources 222 would be apparent to one ofskill in the art. Similarly, some aspects of the present technology maybe described from the perspective of a client device or a video source,and the corresponding actions performed by the video server would beapparent to one of skill in the art. Furthermore, some aspects of thepresent technology may be performed by the server system 164, a clientdevice 220, and a video source 222 cooperatively.

In some implementations, a video source 222 (e.g., a camera 118)transmits one or more streams of video data to the server system 164. Insome implementations, the one or more streams may include multiplestreams, of respective resolutions and/or frame rates, of the raw videocaptured by the camera 118. In some implementations, the multiplestreams may include a “primary” stream with a certain resolution andframe rate, corresponding to the raw video captured by the camera 118,and one or more additional streams. An additional stream may be the samevideo stream as the “primary” stream but at a different resolutionand/or frame rate, or a stream that captures a portion of the “primary”stream (e.g., cropped to include a portion of the field of view orpixels of the primary stream) at the same or different resolution and/orframe rate as the “primary” stream.

In some implementations, one or more of the streams are sent from thevideo source 222 directly to a client device 220 (e.g., without beingrouted to, or processed by, the server system 164). In someimplementations, one or more of the streams is stored at the camera 118(e.g., in memory 406, FIG. 4) and/or a local storage device (e.g., adedicated recording device), such as a digital video recorder (DVR). Forexample, in accordance with some implementations, the camera 118 storesthe most recent 24 hours of video footage recorded by the camera. Insome implementations, portions of the one or more streams are stored atthe camera 118 and/or the local storage device (e.g., portionscorresponding to particular events or times of interest).

In some implementations, the server system 164 transmits one or morestreams of video data to a client device 220 to facilitate eventmonitoring by a user. In some implementations, the one or more streamsmay include multiple streams, of respective resolutions and/or framerates, of the same video feed. In some implementations, the multiplestreams may include a “primary” stream with a certain resolution andframe rate, corresponding to the video feed, and one or more additionalstreams. An additional stream may be the same video stream as the“primary” stream but at a different resolution and/or frame rate, or astream that shows a portion of the “primary” stream (e.g., cropped toinclude portion of the field of view or pixels of the primary stream) atthe same or different resolution and/or frame rate as the “primary”stream, as described in greater detail in U.S. patent application Ser.No. 15/594,518, which is incorporated herein by reference.

FIG. 3 is a block diagram illustrating a representative smart device 204in accordance with some implementations. In some implementations, thesmart device 204 (e.g., any devices of a smart-home environment 100,FIG. 1) includes one or more processing units (e.g., CPUs, ASICs, FPGAs,microprocessors, and the like) 302, one or more communication interfaces304, memory 306, communications module 342 with radios 340, and one ormore communication buses 308 for interconnecting these components(sometimes called a chipset). In some implementations, the userinterface 310 includes one or more output devices 312 that enablepresentation of media content, including one or more speakers and/or oneor more visual displays. In some implementations, the user interface 310also includes one or more input devices 314, including user interfacecomponents that facilitate user input such as a keyboard, a mouse, avoice-command input unit or microphone, a touch screen display, atouch-sensitive input pad, a gesture capturing camera, or other inputbuttons or controls. Furthermore, some smart devices 204 use amicrophone and voice recognition or a camera and gesture recognition tosupplement or replace the keyboard. In some implementations, the smartdevice 204 includes one or more image/video capture devices 318 (e.g.,cameras, video cameras, scanners, photo sensor units). The built-insensors 390 may include, for example, one or more thermal radiationsensors, ambient temperature sensors, humidity sensors, IR sensors,occupancy sensors (e.g., using RFID sensors), ambient light sensors,motion detectors, accelerometers, and/or gyroscopes.

The radios 340 enable one or more radio communication networks in thesmart-home environments, and allow a smart device 204 to communicatewith other devices. In some implementations, the radios 340 are capableof data communications using any of a variety of custom or standardwireless protocols (e.g., IEEE 802.15.4, Wi-Fi, ZigBee, 6LoWPAN, Thread,Z-Wave, Bluetooth Smart, ISA100.5A, WirelessHART, MiWi, etc.) custom orstandard wired protocols (e.g., Ethernet, HomePlug, etc.), and/or anyother suitable communication protocol, including communication protocolsnot yet developed as of the filing date of this document.

The communication interfaces 304 include, for example, hardware capableof data communications using any of a variety of custom or standardwireless protocols (e.g., IEEE 802.15.4, Wi-Fi, ZigBee, 6LoWPAN, Thread,Z-Wave, Bluetooth Smart, ISA100.5A, WirelessHART, MiWi, etc.) and/or anyof a variety of custom or standard wired protocols (e.g., Ethernet,HomePlug, etc.), or any other suitable communication protocol, includingcommunication protocols not yet developed as of the filing date of thisdocument.

The memory 306 includes high-speed random access memory, such as DRAM,SRAM, DDR RAM, or other random access solid state memory devices; and,optionally, includes non-volatile memory, such as one or more magneticdisk storage devices, one or more optical disk storage devices, one ormore flash memory devices, or one or more other non-volatile solid statestorage devices. The memory 306, or alternatively the non-volatilememory within the memory 306, includes a non-transitory computerreadable storage medium. In some implementations, the memory 306, or thenon-transitory computer readable storage medium of the memory 306,stores the following programs, modules, and data structures, or a subsetor superset thereof: operating logic 320 including procedures forhandling various basic system services and for performing hardwaredependent tasks; a device communication module 322 for connecting to andcommunicating with other network devices (e.g., network interface 160,such as a router that provides Internet connectivity, networked storagedevices, network routing devices, server system 164, etc.) connected toone or more networks 162 via one or more communication interfaces 304(wired or wireless); an input processing module 326 for detecting one ormore user inputs or interactions from the one or more input devices 314and interpreting the detected inputs or interactions; a user interfacemodule 328 for providing and displaying a user interface in whichsettings, captured data, and/or other data for one or more devices(e.g., the smart device 204, and/or other devices in smart-homeenvironment 100) can be configured and/or viewed; one or moreapplications 330 for execution by the smart device (e.g., games, socialnetwork applications, smart home applications, and/or other web ornon-web based applications) for controlling devices (e.g., executingcommands, sending commands, and/or configuring settings of the smartdevice 204 and/or other client/electronic devices), and for reviewingdata captured by devices (e.g., device status and settings, captureddata, or other information regarding the smart device 204 and/or otherclient/electronic devices); a device-side module 332, which providesdevice-side functionalities for device control, data processing and datareview, including but not limited to: a command receiving module 3320for receiving, forwarding, and/or executing instructions and controlcommands (e.g., from a client device 220, from a server system 164, fromuser inputs detected on the user interface 310, etc.) for operating thesmart device 204; a data processing module 3322 for processing datacaptured or received by one or more inputs (e.g., input devices 314,image/video capture devices 318, location detection device 316), sensors(e.g., built-in sensors 390), interfaces (e.g., communication interfaces304, radios 340), and/or other components of the smart device 204, andfor preparing and sending processed data to a device for review (e.g.,client devices 220 for review by a user); device data 334 storing dataassociated with devices (e.g., the smart device 204), including, but isnot limited to: account data 3340 storing information related to useraccounts loaded on the smart device 204, wherein such informationincludes cached login credentials, smart device identifiers (e.g., MACaddresses and UUIDs), user interface settings, display preferences,authentication tokens and tags, password keys, etc.; local data storagedatabase 3342 for selectively storing raw or processed data associatedwith the smart device 204 (e.g., video surveillance footage captured bya camera 118); a bypass module 336 for detecting whether radio(s) 340are transmitting signals via respective antennas coupled to the radio(s)340 and to accordingly couple radio(s) 340 to their respective antennaseither via a bypass line or an amplifier (e.g., a low noise amplifier);and a transmission access module 338 for granting or denyingtransmission access to one or more radio(s) 340 (e.g., based on detectedcontrol signals and transmission requests).

Each of the above identified elements may be stored in one or more ofthe previously mentioned memory devices, and corresponds to a set ofinstructions for performing a function described above. The aboveidentified modules or programs (i.e., sets of instructions) need not beimplemented as separate software programs, procedures, or modules, andthus various subsets of these modules may be combined or otherwiserearranged in various implementations. In some implementations, thememory 306, optionally, stores a subset of the modules and datastructures identified above. Furthermore, the memory 306, optionally,stores additional modules and data structures not described above.

The smart device 204 depicted in FIG. 3 can take many different formsdepending on the particular embodiment. For example, in some smart-homeenvironments, the smart device 204 can include a keypad or securitysystem. In other embodiments, the smart device 204 may include aninfrared motion detector and/or wireless magnetic switch. In someembodiments, the smart device 204 may include motion cameras that arecompatible with indoor and/or outdoor environments. Various othersmart-home device embodiments may also be realized as implementationsfor the smart device 204 depicted above. Each of these variousembodiments may operate in low-light or no-light environments. Forexample, a keypad for a security system may be operated in the nightwhen a user may be unable to turn on the lights. When initially enteringtheir residence, the user may wish to turn off the security systembefore turning on the lights. In an intrusion scenario, the user maywish to activate the security system without turning on the lights toavoid alerting the intruder to their presence. In each of thesescenarios, the smart device 204 may provide its own integrated lightingfor user convenience.

In many smart devices, the ideal shape for a light source may be asubstantially circular output surface. For example, the keypad mayinclude a substantially circular light ring around the numericalbuttons. This can serve to encircle the user interface with light suchthat the user can see to enter security codes, activation codes, etc. Inanother example, security cameras may benefit from providing a lightring around the camera lens. This can serve to light the viewing area ofthe camera when recording or in response to a user presence. For anysmart device 204, light rings may be provided to generate emergencylighting in low-light scenarios. For example, a hazard detector, motiondetector, and/or magnetic switch may provide emergency or night lightingwhen installed in a user's home, and may activate automatically when auser presence is detected.

Providing light rings for smart devices in any smart-home environment isnot a trivial operation. Smart devices include numerous designchallenges that complicate generating uniform light rings from discretelight sources. First, it is usually advantageous to use light-emittingdiodes (LEDs) as opposed to other lighting techniques, such asincandescent bulbs, halogen bulbs, florescent bulbs, and/or the like.LEDs are lower cost, smaller in size, and typically use far less powerthan these other lighting options. While the output of LEDs can bebrighter and more intense than other light sources, this can also causedifficulties in transforming the discrete LED sources into a uniformring of light. Because LEDs can have such a high luminous intensity,spreading that intensity uniformly through a substantially circularoutput surface can be difficult. For example, areas of the outputsurface that are closer to the LEDs may generally be brighter than otherareas, causing a non-uniform light output on the substantially circularoutput surface.

Another challenge is limiting the number of LEDs that may be present ina smart device. Even given the relatively low cost, many designs maystill need to minimize the number of LEDs present to preserve powerand/or due to space constraints. Many smart devices are batteryoperated, or at least operate on a low-power budget. Therefore, it maybe advantageous to generate a uniform light ring using only a minimalnumber of LEDs. Smart devices are also often very space-constrained intheir physical design. This can lead to very tight constraints whenarranging the placement of LEDs, light guides, lenses, reflectivesurfaces, masks, and/or outputs.

In order to generate low-cost light rings for smart devices in thesmart-home environment, this disclosure describes a number of differenttechniques that may be used when placing LEDs, designing light guides,and arranging substantially circular output surfaces. FIG. 4 illustratesa flowchart 400 of a method of generating a uniform light ring in asmart device, according to some embodiments. The method may includeactivating a plurality of LEDs (402). The method may also includechanneling light from the LEDs into a light guide with a thickness thattapers as light guide sections extend away from the LEDs (404). In someembodiments, the light guide may include a plurality of cutouts thatreceive the LEDs when the LEDs are mounted to a separate circuit board.The method may also include channeling light from the light guidethrough a circular output surface (406). The circular output surface canbe directly visible to a user as a light ring, or may be reflected offadditional services to otherwise diffuse or redirect the light ringoutput.

FIG. 5 illustrates a simplified block diagram of how a tapered lightguide can be used to generate a uniform light ring from discrete LEDs.For simplicity, this diagram only shows a single LED 502 and a singletransmissive section 504 of the light guide. It will be understood, andwill be made readily apparent with the further examples described below,that additional transmissive sections, LEDs, cutouts, masks, and/or thelike may be combined to form an entire light ring assembly for a smartdevice. In this simplified example, the LED 502 will direct light intothe transmissive section 504 of the light guide. The transmissivesection 504 may be sized large enough to capture most if not all of thelight emitted by the LED 502 in a portion of the transmissive section504 that is closest to the LED 502. As the transmissive section 504extends away from the LED 502, a thickness of the transmissive section504 can decrease or taper as the transmissive section 504 extends awayfrom the LED 502.

Depending on the embodiment, the light that is channeled through thetransmissive section 504 of the light guide may be channeled through asubstantially circular output in different ways. In some embodiments,the light channeled through the transmissive section 504 may bereflected upwards perpendicular to the direction of the transmissivesection 504. In other embodiments, the light channeled through thetransmissive section 504 may be emitted through the smaller end of thetransmissive section 504. These configurations may be determined basedon whether the LED 502 is a side-firing LED or a top-firing LED. Furtherexamples of these different configurations will be described in detailbelow. The physical mechanisms for evenly distributing light as it isemitted from the substantially circular output surface will also bedescribed in relation to the embodiments below.

In addition to tapering a transmissive section of the light guide as itextends away from the LEDs, some embodiments may alternatively and/oradditionally use at least a second technique for generating a uniformlight ring from a discrete number of LEDs. FIG. 6 illustrates aflowchart 600 of a method for generating a uniform light ring. Themethod may include activating a plurality of LEDs (602). As describedabove, the light from those LEDs can be channeled into a light guide.Instead of, or in addition to, tapering the light guide, the method mayalso include providing a plurality of micro-lenses in the light guidehaving a relative density that increases as the section of the lightguide extends away from each LED (604). As the light is channeledthrough the transmissive portion of the light guide, the micro-lensesmay cause the light to exit through the substantially circular outputsurface to provide a uniform light ring (606).

FIG. 7 illustrates a simplified diagram of a transmissive section 704 ofa light guide with a plurality of micro-lenses 705, according to someembodiments. Like the example of FIG. 5, the transmissive section 704can be wide enough near the LED 702 such that most of the light from theLED 702 is captured by the transmissive section 704. As the light movesthrough the transmissive section 704, the light can be reflectedperpendicularly such that the light exits through the top of thetransmissive section 704. As transmissive sections such as transmissivesection 704 are linked or formed together in a circular fashion, thelight can be reflected perpendicularly to form a uniform light ringusing the micro-lenses 705. In some embodiments, the micro-lenses may bepolished, half-spherical cavities that are removed from the bottom ofthe transmissive section 704. As the light moves through thetransmissive section 704 and encounters the round indentations, thelight may reflect upwards away from the micro-lenses.

In order to reflect a uniform amount of light as it travels through thetransmissive section 704, the relative density of the micro-lenses 705can increase. This allows the light to continue traveling through thetransmissive section 704 when it is close to the LED 702 such that eachsection of the transmissive section 704 will have enough remaining lightto be scattered upwards by the micro-lenses 705. Additionally, becausethe intensity of the light near the LED 702 will be greater, fewermicro-lenses 705 may be required to equal the luminous intensity of thereflected light farther away from the LED 702. Stated another way, theincreasing number of micro-lenses 705 away from the LED 702 cancompensate for the brightness that will be inherent closer to the LED702. Additionally, fewer micro-lenses 705 near the LED 702 may ensurethat enough light reaches the other end of the transmissive section 704before being scattered near the LED 702.

The relative density of the micro-lenses 705 can be increased by addingmore micro-lenses 705. Alternatively or additionally, the relativedensity of the micro-lenses 705 can also be increased by changing thethickness of the transmissive section 704. For example, some embodimentsmay use a uniform pattern of micro-lenses 705 while tapering a thicknessof the transmissive section 704 as it extends away from the LED 702 asillustrated in FIG. 5.

To show how these different techniques for generating uniform outputsfor substantially circular light rings can be combined and implementedin different embodiments, four specific implementations will now bedescribed. Some implementations will use a tapering of the thickness oftransmissive sections between each LED, while other implementations willuse changes in the relative density of the micro-lenses. Someimplications will use a combination of both techniques, along with othertechniques such as masking and/or reflecting light internally within thedevice. It should be recognized that these examples and combinations oftechniques shown by way of example and are not meant to be limiting. Anyof the techniques described herein may be used in any combination andwithout limitation in any implementation.

FIG. 8 illustrates a smart device that may be used as a motion detectorand/or magnetic contact switch for a home security system, according tosome embodiments. The device 802 may be relatively small in size (e.g.,less than 4 inches long with a diameter of less than 1 inch). The device802 can be secured to a wall next to a door or window. The door orwindow may include a second small magnetic device that is sensed by thedevice 802 when the door/window is closed. Additionally, the device mayinclude a domed cover 806 that serves as both a press button and awindow/lens for a passive infrared (PIR) sensor. A user can press thecover 806 to experience a tactile “click” that can be used as an inputto program, activate, or otherwise interact with the device 802. Thecover 806 may appear translucent, but may still allow infrared energy topermeate the cover 806 such that a PIR sensor inside the device 802 canbe used to detect user presence and/or motion.

When mounted on the wall or door/window frame, the device 802 can bemounted vertically as shown on the left in FIG. 8. The cover 806 can beoriented in approximately a 45° angle looking down and out into theroom. Beneath the cover 806, the device 802 may include a light ring804. The light ring 804 can be generated by a discrete number of LEDs.In this embodiment, the light ring 804 can include a number ofreflections after the light is emitted from a substantially circularoutput surface such that the light is diffused when visible outside ofthe device 802 to a user. The light ring 804 can be activated bypressing the cover 806. The light ring 804 can also be automaticallyactivated at night when a user presence is detected. For example,placing a plurality of the devices 802 in a residence on various doors,windows, and walls can provide emergency or nighttime lighting as a userwalks through the residence in the dark.

There are a number of challenges when designing a uniform light ring 804in a device as small as device 802. For example, because device 802 isbattery-power, a minimal number of LEDs should be used. Additionally,the luminous intensity of the LEDs may be large compared to the size ofthe device 802. Therefore, certain design features described below areimplemented to prevent light from leaking throughout the internal cavityof the device 802 and causing a “glowing” effect throughout the devicerather than a singular output at the light ring 804. Additionally, thelight ring 804 is built into the same assembly as the cover 806. Thus,when pressing the cover 806 to activate the button functionality, theentire light ring assembly 804 moves. Finally, the light ring assemblyand function should not be allowed to interfere with the PIR sensor asit detects human presence and motion.

FIG. 9 illustrates an exploded view of the smart device 802 for a homesecurity system, according to some embodiments. The device 802 mayinclude a light mask 912 that prevents light from leaking out of thedevice 802. Without the light mask 912, the case of the device 802 maybe thin enough that it would produce a “glow” effect because the LEDs910 are located close to the edge of the device on the circuit board909. In some embodiments, the light mask 912 can be taped to the insideof the housing of the device 802. The light mask 912 can be constructedusing a thin plastic Mylar® tape or other type of stretched polyesterfilm or plastic that is at least semi-opaque. The light mask 912 can bea dark color, such as black, on the inside to absorb excess lightemitted by the LEDs 910 and to keep the excess light from reflectingaround the interior of the device 802. One of the benefits of using thelight mask 912 is that it helps ensure that the light emitted from theLEDs 910 follows the path through the light guide 908 described belowinstead of being dispersed throughout the interior of the device 802.

The device 802 also includes the circuit board 909 with two LEDs 910mounted on the circuit board 909. In order to minimize the cost andcomponent count for the device 802, a minimum number of two LEDs may beused to generate the light ring. The LEDs may include RGB LEDs that aretop-firing, or which emit light from the top of the LED perpendicular tothe circuit board 909. In some embodiments, the LEDs 910 can be mountedat 3 o'clock and 9 o'clock on the circuit board 909. In the embodimentshown in FIG. 9, the left LED is mounted between 9 o'clock and 10o'clock on the circuit board 909, and the right LED is mounted between 2o'clock and 3 o'clock on the circuit board 909. This nonsymmetricmounting pattern can be explained by the orientation of the device 802when mounted to the wall. When mounted, the portion of the light ring at12 o'clock will be closest to the users, while the portion of the lightring at 6 o'clock will be almost nonvisible. Therefore, the LEDs 910 maybe rotated towards 12 o'clock to provide more light where it is mostvisible to users. Some embodiments also include a third LED 911 that canbe used for a “pathlight” feature. The third LED 911 can be a white LEDthat is activated in low-light situations.

The device 802 may also include a light guide 908. As described above,the light guide 908 may include two cutouts that correspond to the LEDs910 on the circuit board 909. In other embodiments, the light guide 908may instead include flat interfaces on the bottom that can be positionedabove the LEDs 910. In some embodiments, the light guide 908 may beentirely clear and translucent. In other embodiments, the light guide908 may instead be doped with a white powder, such as titanium dioxide,to create a milky or semi-translucent effect. By doping the plastic ofthe light guide 908, this creates the effect of softening the lightbefore it is omitted from the device 802. Additionally, the doping ofthe light guide 908 may cause the light to scatter internally and spreadout in the light guide 908 before it is emitted.

Scattering the light internally in the light guide 908 can havebeneficial effects for generating a uniform light ring appearance.Specifically, as described above, the thickness of the light guide 908tapers as it moves away from the LEDs 910. The light guide is thickestdirectly above the LEDs 910. As the light emitted by the LEDs 910 movesthrough the light guide 908 towards the top and bottom (12 o'clock and 6o'clock) of the light guide 908, the thickness of the light guide 908tapers. Because the light guide 908 is thickest above the LEDs, thelight that is directly emitted from the LEDs is softened and diffused.As the light spreads to the portions of the light guide 908 that are notdirectly above the LEDs 910, the thinner portions of the light guide 908do not scatter the light as much. This tapered effect of the light guidecauses the overall output of the light guide 908 to be nearly uniformwhen emitted. The portions of the light guide 908 that taper as theyrotate away from the position of the LEDs 910 may be referred to as thetransmissive regions of the light guide 908 with a thickness that tapersas it extends away from the LEDs 910 as described above.

The light guide 908 may include a substantially circular output surface907 at the top of the light guide 908. The top, polished ring of thelight guide 908 can serve as an output of the light ring. As usedherein, the term “substantially circular” means that the circular natureof the output ring is approximately circular. Specifically, anysemi-major axis and semi-minor axis of the circular shape will be within25% of each other. This allows for slightly elliptical or oval ringsthat are still substantially circular. Additionally, a substantiallycircular ring may include discontinuities, such as the fixture for thethird LED 911 in FIG. 9. To be “substantially circular,” the outputsurface may allow as much as 25% of the ring as discontinuities orinterruptions in an otherwise smooth output surface.

The light guide 908 may also include a reflective mask 925 that isadhered to the outside surface of the light guide 908. The reflectivemask prevents light from escaping the light guide 908. In someembodiments, the reflective mask 925 may be black on the outside andwhite on the inside. The white interior can reflect light internally inthe light guide 908, while the black exterior may prevent light fromleaving the light guide 908. In some embodiments, the interior surfaceof the light guide 908 need not include another reflective mask. Thismay reflect difficulties in assembling the device 802 and adhering aseparate light mask to the inside of the light guide 908. Instead, thedevice 802 may include a rubber gasket 906 that fits on the inside ofthe light guide 908. The rubber gasket fits around the PIR sensor 904and isolates light from the light guide 908 from interfering with thePIR sensor 904. Additionally, the device 802 may include a pet-rejectionmask 902 that blocks a lower portion and the sides of the PIR sensor 904such that normal pet movements (e.g. a dog, a cat) do not trigger thePIR sensor 904. Both the rubber gasket 906 and the pet-rejection mask902 aid in keeping the light from the LEDs 910 inside the interior ofthe light guide 908.

The cover 806, the—rejection mask 902, the rubber gasket 906, and thelight guide 908 can be assembled together as a single assembly that isfree to rotate slightly in a hinged motion up-and-down to provide thepush-button functionality described above. This means that the lightguide 908 will move independent of the circuit board 909 and the LEDs910. Thus, in some embodiments, pressing the cover 806 can cause thelight guide 908 to move closer to the LEDs 910 on the circuit board 909.This can cause the light captured by the light guide 908 to increase asit moves closer to the LEDs 910. Consequently, this can also cause theintensity of the light emitted by the substantially circular outputsurface 907 to increase when the button is depressed. Thus, thisimplementation can provide the benefit of increasing the intensity ofthe light ring momentarily when the button is depressed.

FIG. 10 illustrates a side view of the light ring assembly from FIG. 9,according to some embodiments. This view illustrates the small gapbetween the LEDs 910 and the bottom of the light guide 908. As the cover806 is depressed and the light ring assembly moves inward, the bottomsurface of the light ring 908 will come closer to, and possibly evencontact, the top of the LEDs 910. This view also shows how the cover 806and the rubber gasket 906 provide a light mask on the interior of thelight guide 908 to prevent light from escaping from the interior of thelight guide 908.

FIG. 10 also illustrates how the light that is omitted from thesubstantially circular output surface 907 may not be directly viewableby a user. Instead, the light output from the light guide 908 may bereflected off of the body of the device 802 and/or the cover 806. Thisreflected light may cause a portion of the device 802 near the cover 806and substantially circular output surface 907 to produce a localizedglow effect that is secondary to the actual reflected light from thelight guide 908.

FIG. 11 illustrates a cross-sectional view of the light path exiting thedevice 802, according to some embodiments. As light exits the LED 910,it is captured by the bottom side of the light guide 908. The light mask925 on the outside of the light guide 908 internally reflects the lightinside of the light guide 908 to ensure that the light travels upwardsrather than scattering within the device 802. Similarly, the cover 806and the rubber gasket 906 keeps light inside of the interior of thelight guide 908. In FIG. 11, the light is traveling straight up from theLED 910. However, as described above, light will also travel around thelight guide through the tapered transmissive sections and reflect offthe bottom of the tapered sections to travel upwards out of thesubstantially circular output surface 907.

After exiting the light guide 908, the light may reflect off of theoverhang of the cover 806. Some of the light may be absorbed by thecover 806 giving a glowing effect to the outer rim of the cover 806. Thelight is reflected will been be reflected off of the housing of thedevice 802. In some embodiments, this reflection can occur off of theplastic of the case of the device 802. The plastic may be white oranother light opaque color. Some embodiments may also include a piece ofreflective tape on the portion of the cover of the device 802 on whichthe light is reflected.

FIG. 12 illustrates a second implementation of a smart device 1202 thatcan be installed in a smart-home environment, according to someembodiments. This device 1202 may comprise a video camera that isdesigned for use both indoors and outdoors. The camera may include arobust housing that provides for a camera input at the center of thefront lens 1204. Around a periphery portion of the front lens 1204, thedevice 1202 may also include a light ring that is illuminated such thatthe device 1202 can record in low-light environments. The light ring mayalso become illuminated when the device 1202 detects motion or a humanpresence within its field of view.

FIG. 13 illustrates some of the internal components of the device 1202.As was visible in FIG. 12, the device may include an outer cover 1302.The outer cover 1302 may include a diffusing layer 1303 on the bottom.The diffusing layer 1303 receives light from the two-shot light guide1304 described below. The diffusing layer 1303 slowly extracts the lightfrom the focused output of the light guide 1304 and diffuses the lightin a gradient-like fashion. This generates an intense light ring rightnear the edge of the diffusing layer 1303 that slowly decays. Incontrast to the device 802 described above, the user will see the actuallight diffused through the diffusing layer 1303 rather than viewingreflected light that is reflected off of other surfaces on the device1202.

The device 1202 also includes a circuit board 1306. In order to generatea uniform light ring, the circuit board 1306 may include a plurality ofLEDs 1308. The LEDs used in this particular embodiment are top-firingLEDs that emit light perpendicular to the circuit board 1306. In thisembodiment, nine LEDs 1308 have been evenly distributed around acircular pattern on the periphery of the circuit board 1306. In otherembodiments, more or fewer LEDs 1308 may also be used. In practice, thenumber of LEDs 1308 may be increased until the output of the light ringappears uniform. Additionally, the circuit board 1306 may include awhite solder mask 1310 that is applied to the top side of the circuitboard 1306 around the LEDs 1308. Any light output from the LEDs 1308that is scattered or not received by the light guide 1304 can bereflected by the white solder mask 1310.

One of the difficulties encountered in the design of the device 1202 isgenerating a uniform light ring output through the diffusing layer ofthe outer cover 1302 using a small number of discrete LEDs 1308. Withoutthe unique design features described below in the light guide 1304, theoutput of the light ring would appear to have “hotspots” above each ofthe LEDs 3008. Thus, the output would look entirely nonuniform and maydistract users. The light guide 1304 is manufactured to include certainfeatures that scatter and reflect light such that the output along thesubstantially circular output surface at the top of the light guide 1304is nearly uniform.

FIG. 14 illustrates the three different pieces of the light guide 1304.A middle layer 1402 of the light guide 1304 can be cast from atransparent plastic. After the middle layer 1402 is cast, an insidelayer 1404 and an outside layer 1406 can be cast around the middle layer1402 using a 2-shot process. The inside layer 1404 and the outside layer1406 can be cast from an opaque plastic. Therefore, the inside layer1404 and the outside layer 1406 can form a light mask around the middlelayer 1402. The only portions of the middle layer 1402 that are exposedare the circular ring along the bottom of the middle layer 1402 thatwill be up against the circuit board 1306, and a small ring around thetop of the middle layer 1402 that will act as the substantially circularoutput surface for the light guide 1304.

FIG. 15 illustrates a view of the middle layer 1402 of the light guide1304, according to some embodiments. The substantially circular outputsurface 1502 runs along a top exterior of the middle layer 1402. Thebottom of the middle layer 1402 includes a plurality of cutouts 1504that are sized and spaced to accept each of the LEDs 1308 on the circuitboard 1306. The spaces in between the cutouts 1504 can be pressed upagainst the circuit board 1306 to prevent light from leaking out of thecutouts 1504.

The middle layer 1402 also includes a plurality of transmissive sections1506 between the cutouts 1504 for the LEDs. Each of a transmissivesections 1506 is scalloped to help guide the light from the LEDs to thesubstantially circular output surface 1502. Specifically, as thetransmissive sections 1506 extend away from the cutouts 1504, each ofthe transmissive sections 1506 has a thickness that tapers as theyextend away from the cutouts 1504. Each of the transmissive sections1506 becomes thinnest at the point directly above the cutouts 1504. Asthe transmissive sections 1506 radiate outward from a line extendingdirectly above the cutouts 1504, the tapering becomes less pronounced.This produces a scalloped profile along the exterior of the middle layer1402.

The effect of the scalloped profile of the transmissive sections 1506 isto scatter the light from the LEDs uniformly around the output surface1502. The scalloped design gradually reflects light as it travels upwardthrough the middle layer 1402 so that by the time the light reaches thetop, it is fairly uniformly distributed. This allows the light to spreadnaturally throughout the light guide along the transmissive sections1506. Physically, this has the effect of aperturing how much light getsthrough directly above the LEDs. Because the light guide becomesthinner, the amount of light is choked above the LEDs and reflected tothe areas between the LEDs where the excess light is needed.

FIG. 16 illustrates a cross-sectional view of the device 1202 that showsthe light path, according to some embodiments. The light is initiallyemitted from the LEDs 1308, each of which resides within one of thecutouts 1504 in the light guide. The light travels up the middle layer1402 of the light guide as described above, such that the light isscattered and uniformly emitted from the substantially circular outputsurface 1502. After exiting the output surface 1502 of the light guide,the light enters the diffusing layer 1303 where light is furtherscattered and softened before it is channeled upwards through the outercover.

FIG. 17 illustrates a device 1702 that can be used as part of a homesecurity system or smart-home environment, according to someembodiments. The device 1702 includes a keypad 1708 that can be used toauthenticate a user, activate/deactivate a home security system, programsmart-home devices, dial phone numbers, enter security codes, and soforth. The device 1702 may also include a motion sensor 1706 positionedon the side of the device 1702. The motion sensor 1706 can be used todetect a user approaching the device 1702 to use the device. The motionsensor 1706 can also be used as a motion and/or intrusion detectionsystem in conjunction with other PIR sensors spread throughout thesmart-home environment.

When the device 1702 detects a user approaching the device 1702 usingthe motion sensor 1706, the device 1702 can cause the light ring 1704 tolight up to facilitate user interaction. In other cases, when the keypad1708 detects a user interacting with the device 1702 (e.g., pressing thebuttons of the keypad 1708), the device 1702 can cause the light ring7004 to light up. The light ring 1704 may encircle the perimeter of thetop of the device 1702 and may emit enough light that the keypad 1708 isilluminated such that a user can see the buttons being depressed in adark environment. Like the uniform light rings discussed above, thelight ring 1704 can be powered by a plurality of discrete LEDs. Despitethe tendency of the light ring 1704 to the brightest at the locations ofthe LEDs, the design describe below causes the light ring 1704 to appearto be uniformly illuminated around the circular output surface.

FIG. 18 illustrates a light ring assembly 1800 for a device 1702 havinga keypad, according to some embodiments. The light ring assembly 1800includes a circuit board 1801. The circuit board includes a plurality ofLEDs 1802 that are distributed evenly in a circular pattern about theperiphery of the circuit board of 1801. The LEDs 1802 in this embodimentmay be side-fire LEDs where light is emitted from the side of the LEDs1802 in a direction that is parallel to the surface of the circuit board1801. The LEDs 1802 can be RGB LEDs, or any other type of board-mountedLEDs. Although not shown explicitly in FIG. 18, the circuit board 1801may include mechanical mounting features, and other electroniccomponents that are integral to the keypad assembly or other internalelectronics of the device 1702.

On the top of the periphery of the circuit board 1801, the light ringassembly 1800 may include a mask 1804. The mask may be comprised of athin Mylar tape, thin plastic layer, or other opaque material that willreflect light that is emitted from the LEDs 1802. The mask 1804 can becoupled to the bottom of a light guide 1806. Like the light guidesdescribed above, the light guide 1806 can be formed from a translucentor semi-translucent piece of plastic. As will be described in greaterdetail below, the light guide 1806 includes geometric formations, suchas a tapered transmissive section, along with features such asmicro-lenses that cause the light to be emitted through a circularoutput surface uniformly.

Some embodiments may also include tape masks 1808 that are precut inspecific geometric patterns that maximize the uniformity of the lightthat is transmitted vertically out of the light guide 1806. In thisembodiment, each of the LEDs 1802 has a corresponding tape mask 1808secured to the light guide 1806 above a portion of the LEDs 1802. Thetape masks 1808 can be reconfigured to attenuate the amount of lightthat is transmitted upwards directly over the LEDs 1802 where the lightemitted from the LEDs 1802 is the most intense. As the tape masks 1808taper, they can gradually allow more light to exit the light guide 1806into an output ring 1810. The output ring 1810 may also be formed of atranslucent or semi-translucent plastic that can direct the lightthrough a substantially circular output surface 1812 that is exposed tothe top of the device 1702. In some embodiments, the output ring 1810can be doped with material to cause the light to diffuse before isomitted from the output surface 1812.

FIG. 19 illustrates a detailed view of the light guide 1806, accordingto some embodiments. The light guide 1806 may include a plurality ofcutouts 1905 that are sized to accept the side-firing LEDs 1802 that aremounted to the circuit board 1801. A portion of the cutouts 1905 may besubstantially flat in front of the LEDs, or alternatively may be shapedto conform to a shape of the LEDs 1802. The light guide 1806 may alsoinclude a plurality of features 1908 that can be mated with mountingfeatures on the circuit board 1801 to ensure that the LEDs 1802 line upwith the cutouts 1905 in the correct orientation and direction.

Between the cutouts 1905 of each pair of LEDs 1802, the light guide 1806may include a transmissive section 1906. As with the other embodimentsdescribed above, the transmissive section 1906 can gradually taper inthickness as it extends away from the LEDs 1802 in the direction thatthe light from the LEDs 1802 is traveling. As described above, this hasthe effect of channeling a majority of the light from the LEDs 1802 downthe transmissive section 1906 away from the LEDs 1802. This channelslight away from the LEDs 1802 such that it can be reflected verticallyout of the light guide 1806 evenly throughout the transmissive sections1906. Without this tapering effect, the majority of the light from theLEDs would exit the light guide 1806 directly in front of the LEDs 1802,causing an intense bright spot in the light ring and causing it to nothave a uniform light output.

In this embodiment, the light guide 1806 includes a second feature inaddition to the tapered transmissive sections 1906 that is configured togenerate a uniform light output in the light ring. Specifically, thelight guide 1806 includes a plurality of micro-lenses 1904 that areformed on a bottom side of the light guide 1806. The micro-lenses act asa scattering features that stop the light from traveling down thetransmissive section 1906 of the light guide and instead cause the lightto scatter and reflect in an upward direction perpendicular to thecircuit board 1801 and the light guide 1806. In some embodiments, themicro-lenses 1904 may include a plurality of hemispheres or cut-outsthat are highly polished and cut out into the bottom side of the lightguide 1806. Because the surfaces of the light guide 1806 are highlypolished, most of the light would continue moving down the transmissivesection 1906 of the light guide 1806 due to total internal reflection(TIR) without reflecting upwards into the output ring 1810. Themicro-lenses disrupt the TIR and cause the light to exit the light guide1806 in a uniform fashion throughout the length of the transmissivesection 1906.

The micro-lenses 1904 can be formed in the bottom surface of the lightguide 1806 using laser etching. In other embodiments, the micro-lenses1904 may be formed using diamond turning. Generally, the more sphericaland polished the shape of the micro-lenses 1904, the more light will bereflected properly. In some embodiments, prototypes or test patterns ofmicro-lenses 1904 can be generated using a laser cutter. Someembodiments may include micro-lenses 1904 that are approximately 50microns deep for a light guide 1806 that is approximately 1.5 mm wide inthe vertical direction. Generally, the size and depth of themicro-lenses 1904 can be proportional to the vertical width of the lightguide 1806. If they are too large compared to the vertical width of thelight guide 1806, then too much light may be reflected too early in thetransmissive section 1906. At the same time, if the relative size of themicro-lenses 1904 is too small, then not enough light will be reflecteduniformly throughout the length of the transmissive section 1906.

The micro-lenses 1904 can have a relative density that increasesthroughout the length of the transmissive section 1906. Stated anotherway, the number of micro-lenses 1904 per unit of horizontal thickness ofthe light guide 1806 can increase as the transmissive section 1906extends away from the LEDs 1802. As used for this embodiment, the“thickness” of the light guide 1806 refers to the horizontal thicknessof the light guide in a direction parallel to the circuit board 1801,while the “width” of the light guide 1806 refers to a vertical width ofthe light guide in a direction perpendicular to the circuit board 1801.The relative density of the micro-lenses 1904 can change through thetransmissive sections 1906 in different ways. In some embodiments, thespacing between the micro-lenses can decrease as the transmissivesection 1906 extends away from the LEDs 1802. Thus, the micro-lenses1904 can be more spread out close to the LEDs 1802 and arranged closertogether towards the end of the transmissive sections 1906. In theembodiment shown in FIG. 19, the micro-lenses 1904 can alternativelyhave a uniform spacing throughout the length of the transmissive section1906, but the relative density of the micro-lenses 1904 can change basedon the thickness and the tapering of the transmissive section 1906.

In the embodiment of FIG. 19, the thickest portion of the transmissivesection 1906 that is less populated with micro-lenses 1904 allows thelight from the LED 1802 to travel down the length of the transmissivesection 1906 without being reflected upwards. The relatively few numberof micro-lenses 1904 close to the LEDs 1802 causes only a portion of thelight to be reflected upwards near the LEDs 1802. Because the light ismost intense near the LEDs, and because some light from the LEDs 1802will be initially directed upwards from the LED itself 1802, fewermicro-lenses 1904 are required to reflect light upwards near the LEDs1802. However, as the light travels down the transmissive section 1906,the tapering effect of the thickness of the transmissive sections 1906will cause the light to intersect with more of the micro-lenses 1904,causing a uniform amount of light to be reflected upwards by themicro-lenses 1904. This gradual density increase causes a uniform amountof light to be reflected upwards by the micro-lenses 1904 along thelength of the transmissive section 1906. The combination of the taperingof the transmissive sections 1906 and the relative density of themicro-lenses 1904 generates a uniform light ring output from theplurality of discrete LEDs 1802.

FIG. 20 illustrates a top view of the light guide 1806 with the tapemasks 1808 applied to the top of the light guide 1806, according to someembodiments. The tape masks 1808 can be die cut pieces of light-blockingtape. In some embodiments, both sides of the tape masks 1808 can bewhite to reflect light, and the middle layer of the tape can be a lightblocking and/or dark material. The tape masks 1808 may have the effectof shielding at least a portion of the initial bright output of the LEDs1802 from the output ring 1810. The shape of the tape masks 1808 can beeasily experimented with and tunable based on each individualembodiment. The shape of the tape masks 1808 in FIG. 20 is specificallytuned to the shape of the specific light guide 1806.

In this embodiment, the tape masks 1808 include cutouts around the LEDs1802 that are configured to allow just enough light emitted from theLEDs 1802 to be reflected directly upwards without overwhelming thatsection of the output ring 1810. The cutout behind the LEDs 1802 allow aportion of indirect light to escape upwards from the previous LED in thecircle. Each individual embodiment can use different patterns of tapemasks 1808 to generate a uniform light ring. This can be done byexperimentation. For example, different configurations of tape masks1808 can be applied, and camera images can be taken of the lightoutputs. The light image of the light ring can be divided into aplurality of sectors (e.g., 360 sectors, and the pixels in each sectorcan be averaged. Plots can be generated of the light intensity versusthe rotation angle around the light ring. This plot can show exactlywhere in each rotation more light needs to be allowed to exit the lightguide 1806, and where more light needs to be blocked by a tape masks1808.

FIG. 20 also illustrates a shelf 2002 in the light guide 1806. The shelf2002 may be a piece of plastic on the light guide 1806 that does nottaper with the rest of the transmissive section 1906. The shelf 2002 canbe on a bottom portion of the transmissive section 1906 and can berelatively thin such that only a small amount of light travels down theshelf 2002 instead of being forced over the micro-lenses 1904. The shelf2002 can be formed in the light guide 1806 to provide structural supportfor the small end portion of the transmissive section 1906. By makingthe shelf 2002 relatively thin and near the bottom of the light guide1906, the effect of the shelf 2002 on the light being uniformly emittedas it runs through the micro-lenses 1904 can be minimized.

FIG. 21 illustrates a device 2102 that can be used as an indoor imagingcamera, according to some embodiments. The camera device 2102 includes astand 2106 for positioning a direction of a head unit 2108 of the cameradevice 2102. The head unit 2108 can include a front face that includes acover 2110. The cover 2110 may include apertures or windows formicrophones, infrared (IR) illuminators, the camera sensor assemblyitself, an ambient light sensor, and/or other camera components. Aroundthe periphery of the cover 2110, the camera device 2102 may include auniform light ring 2104. As with the other light rings described herein,the light ring 2104 may be of a substantially circular shape, and mayproduce a uniform light ring from a plurality of discrete LEDs. Thelight ring 2104 can be used to illuminate the field-of-view of thecamera device 2102 while recording, as well as to provide statusindicators and emergency/convenience lighting for users walking by thecamera device 2102.

FIG. 22 illustrates a component view of a representative camera assemblyof device 2102, according to some embodiments. This view includes acover element assembly composed of the cover element 2110, an IRreflector 2202, a light diffuser 2204, a light guide 2210, and thecircuit board 2214. In accordance with some implementations, the lightdiffuser 2204 includes a first (inner) section 2208 and a second (outer)section 2206. The inner section 2208 may be comprised of structuralpoly-carbonite. The outer section 2206 may be transparent orsemi-transparent to visible light. The circuit board 2214 includes IRilluminators (e.g., IR LEDs) 2218, visible light LEDs (e.g., RGB LEDs)2220, and an ambient light sensor 2216. The LEDs 2220 may include 6side-firing RGB LEDs, and the LEDs 2220 may be configured to becontrolled individually (e.g., controlled by a camera SoC or processor).Each LED 2220 may correspond to a portion of the light guide 2210. Forexample, the light guide 2210 may include a first transmissive section2212-1 corresponding to the LED 2220-2, and a second transmissivesection 2212-2 corresponding to the LED 2220-3. As shown in FIG. 22,each LED 2220 is oriented in a clockwise manner and the light guide 2210includes a corresponding transmissive section extending from thelocation of the LED 2220 in a clockwise direction. In someimplementations, each transmissive section of the light guide 2210 endswith, or is bounded by, a segmentor (e.g., a light-absorbing substance)that is adapted to prevent light from the LED 2220 from entering otherportions of the light guide 2210. One or more surfaces of the lightguide 2210 not facing the front of the camera may be coated or otherwisetreated with a light absorbing substance (e.g., a black ink) to preventlight from the LEDs 2220 from exiting the light guide 2210 at thatlocation. The LEDs 2220 may also be oriented in a non-clockwise (e.g.,counter-clockwise) orientation in some embodiments.

In some embodiments, the cover element 2110 may be formed from asingle-piece element (e.g., a glass or plastic lens) that resides overthe entire front of the camera device 2102. In some implementations, thecover element 2110 is a single-piece cover glass having a thickness of 1mm, or approximately 1 mm (i.e., within 25%). A light-absorbing coating(e.g., a film or ink) and anti-reflective coating may be added onto therear of the cover element 2110 to prevent light scattering. This coatingmay be located between the area used for IR illumination and the imagesensor entrance, all on the same piece of cover element. In someembodiments, the coating comprises a smooth, matte ink that islight-absorbing across all wavelengths of light.

In some embodiments, a first section of the cover element 2110 may becoated with an opaque film adapted to absorb visible and IR light. Insome implementations, the film is an ink. Second sections of the coverelement 2110 (e.g., corresponding to the IR illuminators 2218) may becoated with an IR transparent film adapted to absorb visible light(e.g., is opaque or semi-opaque to visible light). Third sections of thecover element 2110 may be coated with a film that is semi-transparent(e.g., semi-transparent to IR and/or visible light), the third sectionscorresponding to a status illuminator and/or an ambient light sensor. Insome implementations, the cover element 2110 may be coated with ananti-reflection coating. For example, the cover element 2110 may becoated first with the thin films then with the anti-reflection coatingon top of the thin films. The coatings may be applied to the innersurface of the cover element 2110. In some embodiments, at least one ofthe coatings may be applied to the outer surface of the cover element2110. The cover element 2110 may have an anti-reflection coating appliedto both the inner and outer surfaces. The cover element 2110 may includean opaque coating to prevent, or substantially prevent, light from thecircuit board 2214 from entering the image sensor. One or more of thecoatings comprise a smooth ink adapted to absorb, not scatter, light,such as an opaque ink adapted to absorb visible and IR light. One ormore of the coatings may also me adapted to absorb at least 99% of thelight. For example, the opaque coating may be adapted to absorb at least99% of visible and IR light. One or more of the coatings may comprise arough ink adapted to scatter light, may be applied via vapor deposition,via thin film deposition, via a pattern printing process, and/or via aspray-on process.

The circuit board 2214 comprises the plurality of LEDs 2220 andcircuitry for powering and/or operating the LEDs 2220. The light guide2210 may be adapted to direct light from the LEDs 2220 out the face ofthe camera device 2102. The light guide 2210 may also be adapted toprevent light from the LEDs 2220 from entering the image sensor assemblyof the camera device 2102. The light guide 2210 may further be adaptedto spread the light from the LEDs 2220 in a substantially even mannersuch that the output through the cover 2110 appears as a uniform lightring. The light guide 2210 may be composed of a clear material, such asa poly-carbonite material. The light guide 2210 may include a pluralityof micro-lenses discussed further below to refract the LEDs 2220 andprevent the light from entering the image sensor assembly of the cameradevice 2102. The light guide 2210 may be adapted to provide more uniformcolor and light output to a user from the illuminators. As describedabove, the light guide 2210 includes a plurality of transmissivesections 2212, each segment corresponding to an LED 2220. Each of thetransmissive sections 2212 may include one or more light absorbingelements (e.g., black stickers) arranged between each transmissivesection 2212 to prevent light leakage from one LED 2220 and transmissivesection 2212 combination to another transmissive section 2212.

The light diffuser 2204 may include two or more sections (e.g., an innersection and an outer section). The light diffuser 2204 is adapted todiffuse the light from the LEDs 2220. The light diffuser 2204 may alsobe adapted to direct the light from the LEDs 2220 toward thesubstantially circular output surface on top of the light diffuser 2204.The circuit board 2214 (and corresponding elements such as the lightguide 2210 and/or light diffuser 2204) causes a circular colored (orwhite) light to be emitted from the front of the camera device 2102 as auniform light ring. The light ring may encircle all or substantially allelements of the camera device 2102, such as the image sensor assembly,the IR illuminators 2218, the ambient light sensor 2216, a status LED,and the microphone apertures. In some implementations, the light ringmay be arranged in a non-circular shape, such as a square, oval, orpolygonal shape that generates a uniform light pattern around the shape.

The light ring (and corresponding elements) may operate to indicate astatus of the camera device 2102, another device within or outside ofthe smart-home environment (e.g., another device communicatively coupledeither directly or indirectly to the camera device 2102), and/or theentire connected smart-home environment (e.g., system status). The lightring (and corresponding elements) may cause different colors and/oranimations to be displayed to a user that indicate such differentstatuses.

FIG. 23 illustrates a view of the light guide 2210, according to someembodiments. As described above for the keypad device 1702, the lightguide 2210 includes a plurality of cutouts 2304 that are sized to acceptthe LEDs 2220 on the circuit board 2214. Each of the LEDs 2220 may beassociated with a subsequent transmissive section 2212 of the lightguide 2210. As described above, each of the transmissive sections of thelight guide may have a tapering thickness as the transmissive sections2212 extend away from their corresponding LEDs 2220. Again, the“thickness” refers to the horizontal thickness of the transmissivesection 2212 in the direction parallel to the circuit board 2214. Thistapering effect allows more light from the LEDs 2220 to travel down thelength of the transmissive sections 2212 such that the light can beuniformly reflected upwards throughout the length of the transmissivesection 2212.

Also as described above, the transmissive section 2212 may include aplurality of micro-lenses 2302. The micro-lenses may be arranged suchthat the relative density of micro-lenses increases as the transmissivesection 2212 extends away from the LED 2220. In this embodiment, therelative density of the micro-lenses 2302 increases using at least twodifferent techniques. First, the tapering of the thickness of thetransmissive section 2212 serves to increase the density of micro-lensesper unit thickness of the transmissive section 2212. Second, themicro-lenses 2302 are divided into at least two different sectionshaving different densities. A first section of micro-lenses 2302-1 maybe more densely spaced than a second section of micro-lenses 2302-2 thatis further away from the LED 2220 in the transmissive section 2212.These two sections are shown merely by way of example, and are not meantto be limiting. Other embodiments may use more than two sections ofmicro-lenses 2302, each having different spacings and densities.

In order to isolate one transmissive section 2212 from othertransmissive sections, the end of each transmissive section 2212 mayinclude a reflective/black sticker 2306. The side of the sticker 2306directed towards the previous transmissive section 2212 may include ablack absorptive surface that absorbs any light that would otherwiseextend past the end of the transmissive section 2212. Without thesticker 2306, the light from a previous LED 2220 could bleed into thenext LED 2220 area, causing the area around each LED to appear brighterin the visible light ring. The other side of the sticker 2306 facing theLED 2220 may be a reflective surface or a black surface, depending onwhether the appearance of the light ring above the LED 2220 is toobright or too dark. This decision can be made with each individualembodiment.

FIG. 24 illustrates a cross-sectional view of the assembled device 2102as light is channeled from the LEDs to outside of the device 2102 as auniform light ring. As the light is reflected upwards by themicro-lenses described in FIG. 23, the light exits the light guide 2110through the top surface of the light guide 2110, which may be considereda substantially circular output surface 2404. After exiting thesubstantially circular output surface 2404, the light passes through thelight diffuser 2204 and is reflected horizontally out of the lightdiffuser towards an angled section of the housing 2402 of the device2102. Thus, the user may observe a reflected light output around theoutside of the cover of the device 2102.

In the foregoing description, for the purposes of explanation, numerousspecific details were set forth in order to provide a thoroughunderstanding of various embodiments of the present invention. It willbe apparent, however, to one skilled in the art that embodiments of thepresent invention may be practiced without some of these specificdetails. In other instances, well-known structures and devices are shownin block diagram form.

The foregoing description provides exemplary embodiments only, and isnot intended to limit the scope, applicability, or configuration of thedisclosure. Rather, the foregoing description of the exemplaryembodiments will provide those skilled in the art with an enablingdescription for implementing an exemplary embodiment. It should beunderstood that various changes may be made in the function andarrangement of elements without departing from the spirit and scope ofthe invention as set forth in the appended claims.

Specific details are given in the foregoing description to provide athorough understanding of the embodiments. However, it will beunderstood by one of ordinary skill in the art that the embodiments maybe practiced without these specific details. For example, circuits,systems, networks, processes, and other components may have been shownas components in block diagram form in order not to obscure theembodiments in unnecessary detail. In other instances, well-knowncircuits, processes, algorithms, structures, and techniques may havebeen shown without unnecessary detail in order to avoid obscuring theembodiments.

Also, it is noted that individual embodiments may have been described asa process which is depicted as a flowchart, a flow diagram, a data flowdiagram, a structure diagram, or a block diagram. Although a flowchartmay have described the operations as a sequential process, many of theoperations can be performed in parallel or concurrently. In addition,the order of the operations may be re-arranged. A process is terminatedwhen its operations are completed, but could have additional steps notincluded in a figure. A process may correspond to a method, a function,a procedure, a subroutine, a subprogram, etc. When a process correspondsto a function, its termination can correspond to a return of thefunction to the calling function or the main function.

The term “computer-readable medium” includes, but is not limited toportable or fixed storage devices, optical storage devices, wirelesschannels and various other mediums capable of storing, containing, orcarrying instruction(s) and/or data. A code segment ormachine-executable instructions may represent a procedure, a function, asubprogram, a program, a routine, a subroutine, a module, a softwarepackage, a class, or any combination of instructions, data structures,or program statements. A code segment may be coupled to another codesegment or a hardware circuit by passing and/or receiving information,data, arguments, parameters, or memory contents. Information, arguments,parameters, data, etc., may be passed, forwarded, or transmitted via anysuitable means including memory sharing, message passing, token passing,network transmission, etc.

Furthermore, embodiments may be implemented by hardware, software,firmware, middleware, microcode, hardware description languages, or anycombination thereof. When implemented in software, firmware, middlewareor microcode, the program code or code segments to perform the necessarytasks may be stored in a machine readable medium. A processor(s) mayperform the necessary tasks.

In the foregoing specification, aspects of the invention are describedwith reference to specific embodiments thereof, but those skilled in theart will recognize that the invention is not limited thereto. Variousfeatures and aspects of the above-described invention may be usedindividually or jointly. Further, embodiments can be utilized in anynumber of environments and applications beyond those described hereinwithout departing from the broader spirit and scope of thespecification. The specification and drawings are, accordingly, to beregarded as illustrative rather than restrictive.

Additionally, for the purposes of illustration, methods were describedin a particular order. It should be appreciated that in alternateembodiments, the methods may be performed in a different order than thatdescribed. It should also be appreciated that the methods describedabove may be performed by hardware components or may be embodied insequences of machine-executable instructions, which may be used to causea machine, such as a general-purpose or special-purpose processor orlogic circuits programmed with the instructions to perform the methods.These machine-executable instructions may be stored on one or moremachine readable mediums, such as CD-ROMs or other type of opticaldisks, floppy diskettes, ROMs, RAMs, EPROMs, EEPROMs, magnetic oroptical cards, flash memory, or other types of machine-readable mediumssuitable for storing electronic instructions. Alternatively, the methodsmay be performed by a combination of hardware and software.

What is claimed is:
 1. A light ring assembly for a smart-home device,the light ring assembly comprising: a plurality of light-emitting diodes(LEDs), wherein each of the plurality of LEDs comprises: a front sidethat is configured to emit light; and a back side that is opposite ofthe front side; a light guide, wherein the light guide comprises: aplurality of transmissive sections that are arranged in a ring shape toform the light guide; a plurality of cutouts between the plurality oftransmissive sections that receive the plurality of LEDs, wherein eachof the plurality of cutouts comprises: a first side that receives thelight from a corresponding one of the plurality of LEDs; and a secondside that covers the back side of the corresponding one of the pluralityof LEDs, wherein the second side comprises a surface that absorbs lightemitted from a previous LED in the plurality of LEDs; and an outputsurface that receives light emitted from the plurality of LEDs throughthe plurality of transmissive sections, wherein the output surface issubstantially circular; wherein the plurality of cutouts opticallyseparate light traveling between sequential transmissive sections in theplurality of transmissive sections; and wherein a thickness of theplurality of transmissive sections tapers as the plurality oftransmissive sections extend from the first sides of the plurality ofcutouts to subsequent second sides of the plurality of cutouts.
 2. Thelight ring assembly of claim 1, further comprising a light mask that iscoupled to the light guide and a diffusive ring comprising a translucentvolume through which light from the output surface is diffused beforeleaving the smart-home device.
 3. The light ring assembly of claim 2,wherein the light mask comprises a tape that is adhered to an exteriorsurface of the light guide.
 4. The light ring assembly of claim 2,wherein the light mask is directly above one of the plurality of cutoutsto prevent light emitted from one of the plurality of LEDs in the one ofthe plurality of cutouts from entering the diffusive ring beforeentering the light guide.
 5. The light ring assembly of claim 2, whereina width of the light mask tapers as the light mask extends away from oneof the plurality of cutouts along a top side of a corresponding one ofthe plurality of transmissive sections.
 6. The light ring assembly ofclaim 1, wherein the smart-home device comprises a first reflectivesurface, wherein light emitted from the output surface of the light ringassembly is reflected off of the first reflective surface after passingthrough a diffusive ring and reflected back through the diffusive ringbefore exiting the smart-home device.
 7. The light ring assembly ofclaim 6, wherein the smart-home device comprises a second reflectivesurface, wherein light reflected off of the first reflective surface isreflected off of the second reflective surface outside of the diffusivering before exiting the smart-home device.
 8. The light ring assembly ofclaim 1, wherein a light output of the output surface is substantiallyuniform.
 9. The light ring assembly of claim 1, wherein the plurality ofLEDs consists of two LEDs.
 10. The light ring assembly of claim 1,wherein the plurality of cutouts are evenly distributed in a circularpattern around the light guide.
 11. A method of generating a uniformlight ring in a smart-home device, the method comprising: generatinglight from front sides of a plurality of light-emitting diodes (LEDs),wherein each of the plurality of LEDs comprises: a front side that isconfigured to emit light; and a back side that is opposite of the frontside; receiving the light from the plurality of LEDs at a light guide,wherein the light guide comprises: a plurality of transmissive sectionsthat are arranged in a ring shape to form the light guide; a pluralityof cutouts between the plurality of transmissive sections that receivethe plurality of LEDs, wherein each of the plurality of cutoutscomprises: a first side that receives the light from a corresponding oneof the plurality of LEDs; and a second side that covers the back side ofthe corresponding one of the plurality of LEDs, wherein the second sidecomprises a surface that absorbs light emitted from a previous LED inthe plurality of LEDs; channeling light down the plurality oftransmissive sections, wherein: a thickness of the plurality oftransmissive sections tapers as the plurality of transmissive sectionsextend from the first sides of the plurality of cutouts to subsequentsecond sides of the plurality of cutouts; and the plurality of cutoutsoptically separate light traveling between sequential transmissivesections in the plurality of transmissive sections; and emitting lightfrom an output surface of the light guide, wherein the output surface issubstantially circular.
 12. The method of claim 11, wherein theplurality of LEDs are side-firing LEDs.
 13. The method of claim 12, theplurality of transmissive sections run between each of the plurality ofcutouts in a substantially circular shape.
 14. The method of claim 11,wherein the plurality of transmissive sections have a scalloped shape.15. The method of claim 11, wherein the smart-home device comprises avideo camera with the light guide surrounding a face of the videocamera.
 16. The method of claim 11, wherein the smart-home devicecomprises a motion sensor of a security system.
 17. The method of claim11, wherein the light guide further comprises a plurality ofmicro-lenses in the plurality of transmissive sections.
 18. The methodof claim 11, further comprising diffusing light from the output surfacethrough a diffusive ring comprising a translucent volume before leavingthe smart-home device, wherein the diffusive ring is thicker than thelight guide and comprises a separate doped material from the lightguide.